Merge remote-tracking branch 'intel-speed-select/intel-sst' into review-ilpo

Summary of changes:
- CPU 0 hotplug support is deprecated in the upstream kernel. This
  causes failures during level change for several customers. So, add a
  silent workaround to use Cgroup v2, without user option.
- Increase number of CPUs in a single request
- Fix turbo mode enable/disable issue
- Error handling for invalid input options